from django import forms
from web.forms.bootstrap import BootStrapForm
from web import models
from django.core.exceptions import ValidationError
from utils.tencent.cos import check_file


class FolderModelForm(BootStrapForm, forms.ModelForm):
    class Meta:
        model = models.FileRepository
        fields = ['name']

    def __init__(self, request, parent_object, *args, **kwargs):
        super().__init__(*args, **kwargs)
        self.request = request
        self.parent_object = parent_object

    def clean_name(self):
        name = self.cleaned_data['name']
        queryset = models.FileRepository.objects.filter(file_type=2, name=name, project=self.request.tracer.project)
        if self.parent_object:
            exists = queryset.filter(parent=self.parent_object).exists()
        else:
            exists = queryset.filter(parent__isnull=True).exists()
        if exists:
            raise ValidationError("文件夹已经存在")
        return name


class FileModelForm(forms.ModelForm):
    etag = forms.CharField(label='ETag')

    class Meta:
        model = models.FileRepository
        exclude = ['project', 'file_type', 'update_user', 'update_datetime']

    def __init__(self, request, *args, **kwargs):
        super().__init__(*args, **kwargs)
        self.request = request

    def clean_file_path(self):
        return "https://{}".format(self.cleaned_data['file_path'])

    # 把传递过来的数据验证一下是否正确
    def clean(self):
        from qcloud_cos.cos_exception import CosServiceError
        key = self.cleaned_data['key']
        etag = self.cleaned_data['etag']
        size = self.cleaned_data['file_size']
        if not key or not etag:
            return self.cleaned_data

        # 如果存在，向COS检验文件是否合法
        try:
            result = check_file(self.request.tracer.project.bucket, self.request.tracer.project.region, key)
        except CosServiceError as e:
            self.add_error("key", "文件不存在")
            return self.cleaned_data
        cos_etag = result.get('ETag')
        if cos_etag != etag:
            self.add_error('etag', 'ETag错误')
        cos_length = result.get('Content-Length')
        if int(cos_length) != size:
            self.add_error('size', '文件大小错误')

        return self.cleaned_data
